A powerful tale of absent fathers and estranged children, Joachim Trier’s ‘Sentimental Value’ – his follow-up to the acclaimed ‘Worst Person in the World’ – is primed for Oscar glory come 2026. Annabel Nugent speaks to Trier and his actors Stellan Skarsgård, Renate Reinsve, Inga Ibsdotter Lilleaas and Elle Fanning about parenting, sacrifice, and the importance of making mistakes